/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *    TrainingSetMaker.java
 *    Copyright (C) 2002 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.beans;

import java.io.Serializable;
import java.util.Vector;

import weka.core.Instances;

/**
 * Bean that accepts a data sets and produces a training set
 *
 * @author <a href="mailto:mhall@cs.waikato.ac.nz">Mark Hall</a>
 * @version $Revision: 7329 $
 */
public class TrainingSetMaker 
  extends AbstractTrainingSetProducer 
  implements DataSourceListener, EventConstraints, Serializable, StructureProducer {

  /** for serialization */
  private static final long serialVersionUID = -6152577265471535786L;

  protected boolean m_receivedStopNotification = false;

  public TrainingSetMaker() {
    m_visual.loadIcons(BeanVisual.ICON_PATH
		       +"TrainingSetMaker.gif",
		       BeanVisual.ICON_PATH
		       +"TrainingSetMaker_animated.gif");
    m_visual.setText("TrainingSetMaker");
  }
  
  /**
   * Get the structure of the output encapsulated in the named
   * event. If the structure can't be determined in advance of
   * seeing input, or this StructureProducer does not generate
   * the named event, null should be returned.
   * 
   * @param eventName the name of the output event that encapsulates
   * the requested output.
   * 
   * @return the structure of the output encapsulated in the named
   * event or null if it can't be determined in advance of seeing input
   * or the named event is not generated by this StructureProduce.
   */
  public Instances getStructure(String eventName) {
    if (!eventName.equals("dataSet")) {
      return null;
    }
    if (m_listenee == null) {
      return null;      
    }
    if (m_listenee != null && m_listenee instanceof StructureProducer) {
      return ((StructureProducer)m_listenee).getStructure("dataSet");
    }
    return null;
  }

  /**
   * Set a custom (descriptive) name for this bean
   * 
   * @param name the name to use
   */
  public void setCustomName(String name) {
    m_visual.setText(name);
  }

  /**
   * Get the custom (descriptive) name for this bean (if one has been set)
   * 
   * @return the custom name (or the default name)
   */
  public String getCustomName() {
    return m_visual.getText();
  }

  /**
   * Global info for this bean
   *
   * @return a <code>String</code> value
   */
  public String globalInfo() {
    return "Designate an incoming data set as a training set.";
  }

  /**
   * Accept a data set
   *
   * @param e a <code>DataSetEvent</code> value
   */
  public void acceptDataSet(DataSetEvent e) {
    m_receivedStopNotification = false;
    System.err.println("In accept data set");
    TrainingSetEvent tse = new TrainingSetEvent(this, e.getDataSet());
    tse.m_setNumber = 1;
    tse.m_maxSetNumber = 1;
    notifyTrainingSetProduced(tse);
  }

  /**
   * Inform training set listeners that a training set is available
   *
   * @param tse a <code>TrainingSetEvent</code> value
   */
  protected void notifyTrainingSetProduced(TrainingSetEvent tse) {
    Vector l;
    synchronized (this) {
      l = (Vector)m_listeners.clone();
    }
    if (l.size() > 0) {
      for(int i = 0; i < l.size(); i++) {
        if (m_receivedStopNotification) {
          if (m_logger != null) {
            m_logger.logMessage("T[rainingSetMaker] "
                +statusMessagePrefix() + " stopping.");
            m_logger.statusMessage(statusMessagePrefix()
                + "INTERRUPTED");
          }
          m_receivedStopNotification = false;
          break;
        }
	System.err.println("Notifying listeners (training set maker)");
	((TrainingSetListener)l.elementAt(i)).acceptTrainingSet(tse);
      }
    }
  }

  /**
   * Stop any action
   */
  public void stop() {
    m_receivedStopNotification = true;

    // tell the listenee (upstream bean) to stop
    if (m_listenee instanceof BeanCommon) {
      //      System.err.println("Listener is BeanCommon");
      ((BeanCommon)m_listenee).stop();
    }
  }
  
  /**
   * Returns true if. at this time, the bean is busy with some
   * (i.e. perhaps a worker thread is performing some calculation).
   * 
   * @return true if the bean is busy.
   */
  public boolean isBusy() {
    return false;
  }

  /**
   * Returns true, if at the current time, the named event could
   * be generated. Assumes that supplied event names are names of
   * events that could be generated by this bean.
   *
   * @param eventName the name of the event in question
   * @return true if the named event could be generated at this point in
   * time
   */
  public boolean eventGeneratable(String eventName) {
    if (m_listenee == null) {
      return false;
    }

    if (m_listenee instanceof EventConstraints) {
      if (!((EventConstraints)m_listenee).eventGeneratable("dataSet")) {
	return false;
      }
    }
    return true;
  }
  
  private String statusMessagePrefix() {
    return getCustomName() + "$" + hashCode() + "|";
  }
}

